When you pull on the throttle cable it should move a lever that pulls a spring that pulls the governor arm which in turn moves the throttle rad connected to the carb throttle butterfly.
Honda generally have an adjuster screw , but if that is in all the way then there is generally a tab on one end of the spring that can be bent.
We get slightly different Hondas down here ( the EU models ) to the USA models you get over there .